sync | p2p: Collect more information about invalid network head in metric when rejecting it

[renaynay]

Collect information about peer ID here when recording rejected msg from header-sub (such as the peerID and error message) (and possibly also record the height of the rejected header).

In syncer, record height + reason for rejection here

[Wondertan]

Metrics require listing and coding out all the possible rejection reasons, and they can't be arbitrary. These reasons are implementation-specific, and the Subscriber cannot know all of them internally. I think we need to have this as part of the Syncer metrics

[renaynay]

@Wondertan changed description now - I think it should be recorded in both places as what I want to see is peerID + height of bad header that is getting rejected. We can then correlate it to height + reason from sync metrics